Latest Customer Reviews

K&N Air Filters Reviews

I just bought the engine air filter because of long experience and satisfaction with the K&N filters. Keeps my combustion clean and powerful. Now, I am so pleased with the K&N cabin filters. Quality is amazing.

Not sure which 2004 Cadillac DeVille Air Filters - Custom Fit is right for you? We have over 14143 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:

"The K&N filter arrived sooner than I expected. It was installed with no problem. I have however not driven the car but a few miles since.I am going to drive from Colorado to California Shortly and will then have a better idea of any performance improvement." —Robert R from Berthoud, CO bought a K&N Air Filters for a 2004 Cadillac DeVille.